Query: Add regression test for #20731 (#20774)

Fixed in #20628

Author: smitpatel

test/EFCore.Specification.Tests/Query/GearsOfWarQueryTestBase.cs

@@ -7469,6 +7469,18 @@ public virtual Task Constant_enum_with_same_underlying_value_as_previously_param
                     .Select(g => g.Rank & MilitaryRank.Private));
         }
 
+        [ConditionalTheory]
+        [MemberData(nameof(IsAsyncData))]
+        public virtual Task Enum_array_contains(bool async)
+        {
+            var types = new[] { (AmmunitionType?)null, AmmunitionType.Cartridge };
+
+            return AssertQuery(
+                async,
+                ss => ss.Set<Weapon>()
+                    .Where(w => w.SynergyWith != null && types.Contains(w.SynergyWith.AmmunitionType)));
+        }
+
         protected GearsOfWarContext CreateContext() => Fixture.CreateContext();
 
         protected virtual void ClearLog()

test/EFCore.SqlServer.FunctionalTests/Query/GearsOfWarQuerySqlServerTest.cs

@@ -6979,6 +6979,17 @@ FROM [Gears] AS [g]
 ORDER BY [g].[Nickname]");
         }
 
+        public override async Task Enum_array_contains(bool async)
+        {
+            await base.Enum_array_contains(async);
+
+            AssertSql(
+                @"SELECT [w].[Id], [w].[AmmunitionType], [w].[IsAutomatic], [w].[Name], [w].[OwnerFullName], [w].[SynergyWithId]
+FROM [Weapons] AS [w]
+LEFT JOIN [Weapons] AS [w0] ON [w].[SynergyWithId] = [w0].[Id]
+WHERE [w0].[Id] IS NOT NULL AND ([w0].[AmmunitionType] IN (1) OR [w0].[AmmunitionType] IS NULL)");
+        }
+
         [ConditionalTheory]
         [MemberData(nameof(IsAsyncData))]
         public async Task DataLength_function_for_string_parameter(bool async)